Portable boring tool



May 20, 1930. C, 'ZlGENHElM y 1,759,726

PORTABLE BORING TOOL Filed NOV 14, 1929 2 Sheets-5h99?, 1

May 20; 1930.

c. ZIGENHEIM PORTABLE BORING TOOL Filed Nov, 14, 1929 2 Sheets-Sheet EVS Q www.

Mamma 5 v Patented .May 20, 1930 ATENT OFFICE CONRAD ZIGENHEIM, OF HAMILTON, ONTARIO, CANADA PORTABLE BORING vTOOL Application filed November 14, v1929. Serial No. 407,183.

This invention has relation to porta-ble boring tools, such as hand drills, augers and the like, in which the boring bit, fastened in a suitable chuck or holder isl arranged and adapted to be operated by means of a crank and gearing mounted in a ,suitable brace or frame. The object of the invention is to provide a tool which is adapted to use in boring holes at various angles with reference to the axis of the brace or main shaft through which motion is transmitted from the crank to the chuck or bit holder so thatholes may be boredy in situations not accessible to the v ordinary boring tool, and at angles which are incapable of being bored accurately or uniformly by means o f a bit operatingin alignment with or parallel to the aXis of the stock;

In carrying my invention into effect, I provide a frame or brace having an appropriate hand grip and having, mounted at one end a main gear wheel, to which is secured a crank lever, and a pinion with which said gear wheel is plate in I which the gearland pinion shafts have their bearings are three tubular members, two of which are stationary while the third, located between the stationary members, is keyed to the'pi'nion and adapted to be rotated through ,the operations of the crank, thelarger gear and the pinion.

Telescoping into these tubularmembers are three rods, the middle rod being splined in and rotatable with the middle member. This rod has, keyed to its outer end, a pinion located within a boX or housing and engaging With another pinion, the shaft of which carries a chuck or bit holder, the said shaft being mounted in a head section 'or housing similar to the 'head or housing in which the first named pinion is located, but pivotally attached theretoso that the pinion and shaft l may be rotated in the are of a circle so as to adjustl the bit and holder to different angular positions with relation to the main shaft of the brace.

Means are provided, for rigidly Ysecuring the bit and holder in the desired positions, and means are also provided whereby the frame or brace maybe lengthened or shortcned and its telescopically arranged members in mesh. Secured at their ends to asecured at different or shortening.

degrees of lengthening The invention consists lin the novel features of construction and in the combination hereinafter more specifically. described, with reference to the drawings forming part of this specification in which, l

Figure 1 is a side view of a tool embodying a preferred form of construction;

Figure 2 is an edge view; Figure 3 is a front end view; Figure 4 is a rear end view; Figure 5 is a longitudinaloentral sectional view;

Figure 6 is a side v1ew and partially in section;

Figure 7 is a transverse sectional View on the line 7-7 of The numeral 1 design of elongated form,

Figure 1.

ates a metallic plate upon which is mounted the shaft 2 of a relatively large sized gear wheel 3 to which is attached a suitable crank lever 4, provided with a handle 5. The numeral keyed 6 designates a toothed pinion which is on the end of a tubular shaft member 7, which is rotatable through the operation of the gears and crank. On either side of and in the same tubular members 8 and 9.

pla-ne with the member 7 are the The members 8 and 9 are rigidly secured at oneend to the plate 1. The numeral 10 designates a grip handle which is conveniently attached at oneend to the member 9 and, at the other end to a brackety 11 secured to of the plate 1.

The numerals 12, and rods which are reference to the and projecting from one end arranged and adapted to slide or telescope into the latter.

The-main operating rod 12 has a flattened side as shown at 12a, and is secured in operative relation to the which allows the rod l2 the member 7, but holds member 7 by a set screw 7 to be telescoped into the rod 12 in operalatter turns therewith.

-When the rods 12, 12

and 13 are adj usted to their proper positions they are fixed in such positions by mean.,

s of a set screw 14 U and 13 designate l teleseopwally arranged with members 7, 8, and 9 and are threaded through a collar 14' at the open end of the member 8 and provided with a thumb piece 82. The members 8 and 9 constitute,-

l or tapered on its periphery. e The head piece or bor:- 15 is formed with cheeks 17 and to these cheeks is pivoted a housing 19 in which is arranged another beveled gear wheel 20, which is also beveled on its periphery but in an opposite direction t0 the bevel of the gear 16. The wheel 20 is keyed on a short shaft 21having itsbearings in the base 22 of the housing 19, and in the cover plate 23 which is secured to the housing 19 by screws 24. As will be seen, the housing 19 is rotatable in the arc of a circle around the pivotal screws 25 connecting the housing 19 and the head piece or housing-l5 together. The gear wheels 16 and 20 are normally in mesh side by side as shown in Fig. 5 with their faces on parallel planes and this is the position they will occupy when the tool is used for the ordinary boring or drilling of holes in directions paralllel to the axis of the main shafts 12, 12 and with-a rounded angle as shown in Figs. 5 and* 6, which construction permits the gear 20 when being adjusted for angular boring past the inner angle of the gear 16, while the teeth of the two gears remain in mesh with. each other. 4'

In Fig. 6 the parts are shown as adjusted for boring holes at right angles or perpendicular to the axis of the main shaft, but they vmay beadjusted to any intermediate angle and, by means hereinafter described, secured y in working position. Y

The numeral 30 designates a curvedlever or bar ivotally attached at one end to ears 31 projecting from the housing 19, and at the other end ivotally attached to a collar 32 which is sli ingly splined on theenlarged section 33 fixed on the outer 'end of the member 13. Midway of the ends of the. bar or lever 30 a link 35 is pivoted thereto and is formed with an arcuate slot 36. A brace bar.

or bridge 37V connects the two members 12-13 together, and to such bar or bridge the link 35 is coupled by means of a screw 38 which projects from the bar or bridge, through the slot 36, and ,carries a thumb nut 40.

lI-he short shaft 21 projects through the said pivoted housing,

As will be seen, when the housing 19 with its attachments is turned on its pivot, the collar 32 will be moved along-'the member 33 and the link 35 if loose will be moved inwardly angle of adjustment is reached, the nut 40 will be tightened, thus interlocking the parts together and preventing the boring bit from being thrown out of position.

The head piece or housing 15 is with a protective lidor cover 15 which is hinged at its inner edge to the, top plate of the housing 19andl moves `with the latter. This lid is held closed byy a screw `152 to accommodate which, the lid is slotted as at 15a so that it can' freely move. This lid can be released andraised by removing the screw. 152, and access had to the gearing to oil the same.

- The rod 12 has secured to its outer end a long collar 45, which sockets in a recess 1nthe housing 15, and issec'ured to the barl ory on the screw 38. When-the proper` provided forward mounting, a power shaft j ournalled at its opposite ends'in said mountings, rods connecting said mountings rigidly together,

'a housing pivotally 'attached to the forward mounting, a bit holding shaft journalled in er shaft, a lever connected to said pivotally attached housing, a sleeve mounted slidably 'on one of said rods, and connected to one end of said lever, an adjustable link connection between said lever and a-stationary part of the'said frame, and means for interlocking saidlink at different positions, according to the angular adjustment of the bit holding shaft, thelatter being arranged and adapted for different angular adjustments relatively to the axis of the power shaft.

In testimony whereofI aiiix my signature.

CONRAD ZIGENHEIM.

and geared to said pow-` 

